2778861233 has 2 divisors, whose sum is σ = 2778861234. Its totient is φ = 2778861232.

The previous prime is 2778861193. The next prime is 2778861257. The reversal of 2778861233 is 3321688772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1455575104 + 1323286129 = 38152^2 + 36377^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778861233 - 2²⁶ = 2711752369 is a prime.

It is not a weakly prime, because it can be changed into another prime (2778860233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389430616 + 1389430617.

It is an arithmetic number, because the mean of its divisors is an integer number (1389430617).

Almost surely, 2^2778861233 is an apocalyptic number.

It is an amenable number.

2778861233 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778861233 is an equidigital number, since it uses as much as digits as its factorization.

2778861233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 2778861233 is about 52714.9052261313. The cubic root of 2778861233 is about 1405.9038493845.

The spelling of 2778861233 in words is "two billion, seven hundred seventy-eight million, eight hundred sixty-one thousand, two hundred thirty-three".